Amid very poor visibility, planes seem to be emerging out of nowhere.

The video shows aircraft flying out of thick fog as they land in Heathrow Airport in London.

Heathrow Airport canceled the majority of its flights on Monday, and wrote on Twitter on Tuesday that though the visibility had “improved,” it was still advising customers to consult their airlines before coming to the airport.

Flights were also canceled at London's Gatwick Airport, while the capital’s City Airport was closed to all routes. Even those traveling to work by cable car and by railway were affected by the haze.